Egbert m



(No Model.)

R. M. MQDERMOTT.

DRILLING MACHINE. 'No. 267,912.

Patented Nov. .21, 1882. Y

N. PETERS, Pmwum n w. wmin em. n. C.

U ITED STATES PATENT. OF ICE.

ROBERT M. MGDERMOTT, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE MCDERMOTT AUTOMATIC DRILL COMPANY, OF SAME PLACE.

DRILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 267,912, dated November 21, 1882,

Application filed May 16, 1882. (No model.)

To all whom it may concern Be it known that I, ROBERT M. MGDER- MOTT, of the city of St. Louis, in the State of Missouri, have invented a certain new and usefulImprovementinDrilling-Machines,ofwhich the following is a full, clear,-aud exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to certain improvements in a drilling-machine, which imparts a reciprocating motion to the drill under the influence of a spring or springs; and my invention consists in the hereinafter described and claimed points ofnovelty.

In the drawings, Figure 1 is a side view of my improved drill. Fig. 2 is a top view. Fig. 3 is a detail end view, showing theguide-rollers for the driving-rope. Fig. 4 is across-section on line 4. 4, Fig. 1. Fig. 5 is a cross-section on line 5 5, Fig. 1. Fig. 6 is a front end view. Fig. 7 is a detail enlarged view, parts being in section. Fig. 8 is a detail view, showing the manner of connecting the drill to its operatingspring. Figs. 9, 10, and 11 are detail views, illustrating the manner of securing the drill point or bit to its carryingshaft.

A represents an inverted-T or flanged rail, and A a double T or flanged rail, the two being connected together at one end by a U- shaped frame, B, and at the other end by a block, 0. The block 0 has a central opening, which receives and guides and in which plays the drill-rod 1). The drill-rod is secured to its head E in such a manner that while it is held from endwise movement yet it is allowed to be turned freely on the return of each stroke, so that the drill-point will not strike two consecutive strokes in the same place. I have shown it, in my preferred form, in Fig. 7, with a flange, D, surrounded by a packing, D of rawhide, to keep the two metal surfaces apart and protect them from Wear, secured in a central opening or hole of the head by a crossplate, D and bolts D. On each return movement of the drill it is turned a slight rotation by means of a ratchet-wheel, F, secured to thedrill-rod by a key and feather-groove, D and kept from endwise movement by a strap, F secured to the frame 0. The ratchet-wheel F is acted upon by a pawl, F, pivoted to a vertically-moving bar, F The bar F is held in place and guided by means of lugs C" on the block 0, and is actuated by means of alever, G, hinged at its forward end to the upper end of the bar F and fulcrumed at G to the upper rail, A. The lever is operated by the drillhead, the lever having an adjustable block, G

Theend of the drill-rod has a conical-shapedhole, large portion in, for receiving the similarly-shaped end of the bit D (See Fig. 11.) The end of the drill-rod is formed with a slot, D, so that it can be tightened upon the bit by -a clamp, D made in two pieces, connected by bolts D Thus the drill is held firmly in the drill-rod.

Upon the inner end of the head E is a stem, E, which is connected to an elastic spring,H,

by bolts E, passing through lugs thereon and through the ends of a plate, E (See Fig. 8.) The springH consists of arubber ring stretched over the ends of an elliptical-shaped frame, I, (see Fig. 4,) which has flanges l on its sides,

' by which it is held in a sliding frame, J, working between the rails A A. The inner end, J, of the frame J is formed with a slot, J which receives an eccentric wrist-pin, K on a disk,

K, upon the inner end of a shaft, K,journaled in a frame, L, secured to the rails A A by bolts L L; On the shaft K, outside of the frame, is a grooved pulley, M, which receives a driving-rope, 13, passing between and guided by rollers B, journaled in the frame B, as shown in Fig. 3. The driving-rope should be provided with a suitable idler, so as to be kept taut at all times, and at the same time be adjustable in length to allow the drill to be fed forward as required. Outside of the driving= pulley, on the shaft K, is a fly or balance wheel, N.

O is an elastic bumper or spring, secured to I l i III it will be seen, when the'drill is thrown forward by the oscillating frame and then quickly drawn back by the same, that its momentum will store up power in the two elastic springs 11 0, whose combined force will act to throw it forward on the forward movement of the frame, and thus increase its force and make it more effective in its work, and injury to the machine will not arise, as where a positive motion is given to the parts. The spring 0 is secured to the frame L by having an opening or hole in one end somewhat conical, as shown in Fig. 7, which isstretched over a projection, P, on the end of the frame, which is larger at its outer than at its inner portion. Thus there 'is no, danger of the spring flying off the projection.

Q is afeed-rod journaled in lugs Q, secured to the rail A, for moving the drill forward as desired. It is turned by means ofa crank, Q or it may be turned automatically by havinga ratchet-wheel on its inner end, which would be engaged by a pawl secured to the lower end of the vertically-moving'bar F The feed-rod Q passes through lugs R ofa circular plate or disk, B, which rests upon and is secured to a similar disk, S, by bolts T passing through holes in the lower disk and slots R in the. upper disks. By loosening the bolts T the upper disk can be turned upon the lower one, and thus the drill be adjusted to any desired horizontal position.

U is a box on the under side of the lower disk, S,which receives a transverse rod or shaft, V, which would be supported on any suitable kind ofaframe. The boxis madein two pieces, as shown, so that it can be clamped upon the supporting-shaft V by bolts W, and by loosen-- carrying sheaves B, and the block (J, provided with a central bore for the drill-rod, in combination with the sliding head E, carrying the drill-rod D, and provided with a stem, E the elliptical sliding frame I, with its bearings I, and carrying the elastic strap H, connected with the stem E the sliding frame J, having extension J, provided with slot J and carrying the elastic bumper 0 upon its projection P, the frame L, carrying shalt K, disk K, wristpin K pulley M, and balance-wheel N, and the driving-belt B substantially as and for the purpose described.

2. The inverted-T rail A, carrying the pivoted lever G,with its adjustable block G having an inclined lower face, and hinged at its front end to the bar F the U-shaped frame B, ca-rryin g sheaves B, and block (3, provided with lugs C and strap F in combination with the drill-rod D, carrying ratchet-wheel F, and provided with a feather-groove, D, the bar F hinged at its upper end to'the lever G, and provided with the pawl 1*" and spring G the sliding head E, carrying the drill-rod D, and formed with the inclined lug E and stem E the elliptical frame I, having bearings I, and carrying the elastic strap H, connected with the stem E the sliding frame J, having extension J, provided with slot J the frame L, carrying shaft K, disk K, wrist-pin K grooved pulley M, and balance-wheel N, and the driving-belt B substantially as and for the purpose set forth.

3. In a drilling-machine, the frame A A B (J, provided with lugs Q Q, in combination with the feed screw-rod Q, disk R, provided with lugs It R and curved slots R R disk S, provided with bolts T T and two-part box U, with its uniting-bolts W, and the shaft V, substantially as and for the purpose specified.

ROBERT M. MGDERMOTT.

Witnesses:

SAML. KNIGHT, Gno. H. KNIGHT. 

